penetration

这种防晒霜能减少紫外线对皮肤的穿透深度。

This sunscreen reduces the ___penetration of UV rays into the skin.

这种新型钻头在硬质材料中展现出惊人的穿透力。

The new drill bit shows impressive ___penetration into hard materials.

这种新型钻头可以轻松穿透硬质岩石。

The new drill bit achieves deep ___penetration into hard rocks with ease.